Reproducer



C. J. DELIVIARMOL.

REPRODUCER.

APPLICATION FILED SEPT. 6, 1921.

IAQQQS ZK Paitented July 25, 1922.

MHII DI ATTORNEY naive srarss CHARLES J. DELMARMOL,GF FRANKFORD, PENILSYLVANIA nnrnonn'cnn.

Specification of Letters Patent.

Patented Jinly 255,; i922.

- Application filed. September 6, 1921. Serial no. 493,2?3,

T 0 all whom it may concern.

Be it known that 1, CHARLES J. nnnllvlan- MOL, a citizen of. the United States, residing at F rankford, in the county, of Philadelphia;

of the same.

and State. of Pennsylvania, have invented new and useful Impro'ementsin Reproducers, of'which the following is a spccifi cation.

This invention relates to reproduccrs for talking machines and similar devices for the transmission of sounds and it has for its primary object to provide a reproducer which will efi'ectively reproduce sounds or sound Waves, whilst at the same time the volume of sound so reproduced will be considerably increased.

Another object of this invention is the provision of a reprodicer of the type above referred to which islbxceptionally light in Weight whereby friction on the records is reduced to a minimum.

A further object aimed at is the provisio of a .reproducer characterized by an efi'ective insulation of the stylus bar and its mounting from the main or body portion of the reproducer, whereby foreign noises and scratchy sounds due to metallic contacts are obviated and prevented:

A still further object of this invention is the provision of a reproducer, which is simple in construction, neat in appearance, cheap to manufacture, effective in use, not

liable or susceptible to derangement, and by 1 the employment of which tonal reproduction 45 is raised to a very high dc ree of perfection. .With the foregoingan other objects in view as will become more appa'rent as the followingdescription proceeds, this invention consists essentially of a reprodncer ham ing a resonating chamber in frontv of the "diaphragm" proper and valvular outlets therefrom disposed in eccentric relation to said diaphra m. i

In the furt lier disclosure of the invention reference isto be had to the accompanying sheet of explanatory drawings constituting a part of this specification and in which like characters of reference designate' the sameor corresponding parts in allthe views.

Figure 1-'is' a fragmentary side view of portion of an ordinary phonograph and tone arm having my improved reproducer applied thereto, the latter beingshown from a frontal aspect. Figure ,2-- is an enlarged side elevation of my improved reprsducer detached from the tone arm.

Figure 3- is arear view of the same; and,

Figure .ir" is a central transverse section 10 intermediate its endsand extending sub stantially three parts of the way around its bore and from the front or outer face whereof are stepped borings ll, 12 and 13 axially eccentric with respect to the center of the cylindric body portion 9. It is to be pan ticulanly noted that the boring 11 constitutes the housing for the hard rubber or other appropriate material diaphragm 14 which is supported therein between insulating Washers 15, 1.6 and firmly clamped by a locking ring 17 held in place by screws 18 in'the well known ways. The inner borings 12, 13 respectively, provide a clearance space 19 at the back of the diaphra m and a sound outlet 20 concentric with tie latter and at the 7 back of the rigid diaphragm portion or'Wa-ll 21 there being provided a tubular part or tone-arm connecting means 22 appropriately lined with abushing of rubber 23 whereby the reproducer 8 is frictionally held on said tone arm 7. It is also to be observed that the back of the reproducer 8 is dished or recessed at 24, Whilst the forward part being similarly recessed but 2;) a much larger extent provides a sound aplifyin'g box or resonating chamber VlhlCh is closed in by a thin mica or the like diaphragm 26 held in place by insulating washers 27,28, and a bezel ring 29 circumferentially perforated at 30 to reduce Weight as well as to aid in grippinglthe adjoining Washer. 28 and prevent its movement relative thereto or with respect to the diaphragm 26.

Substantially all around the circumferential wall of the sound amplifying box or resonating chamber 25 and at equal intervals are apertures or holes 31, theouter ends through it bore 35 time S* in the friction on the records,

whereot ere slightiyfiered as shown. Similarly the aforesaid cresent-sheped enlargemerit is drilled or otherwise formed to provide it series of cylindric shaped recesses 32 which connec into' the aforementioned amplifying box or resonating chamber by pin or smell holes Connected centrally of the diaphragm 14 isthe transmitting post 34: which passes in the main or body porwell known Way, and it is enchored to said body portion 9 by means of pivot studs or ltnifeedges 88 contact being maintained by screws 37 between the heads whereof and the bridge 38 are interposed compression springs 39. The stylus on needle 40 is clamped in place by means of screw 41.

In use it will be clearly seen that as the stylus or needle 40 travels over the rotating record 6 the sound vibrations will be conducted by the transmitting post to the diuphriigm l4, and by reason of the peculiar nature and fornuition of the reproducer will be partly distributed between the sound amplifying box or resonating chamber :25 as well as to the tone arm 7, the cylindric shaped recesses 32 and holes 31 serving as vents for the escape of sound.

From the foregoing description it will be apparent that by my invention there is provided an exceedingly light weight reprodueer which eliminates to a great extent all with a consequential reduction in weer and the usual thumb or knurled.

tear to the motor as 1 genes? Well as assuring its economical use. Still further due to the lightness of the reproducer an economy in use of needles is brought about.

Whilst there has been shown and described one practical embodiment of the invention it will be perfectly clear that the same is susceptible of detail modification and variation Without in any Way departing from its essential features, and it is hereby intended to include all such reasonable modificitions as fairly fall Within the scope of the appended claims.

Having described my invention, What I claim as new, and desire to secure by Letters Patent isr l. A sound box comprising e cylindric body, an aperatured wall closing one end of Said body and formed with a peripheral enlargement, a diaphragm, a supplemental diaphragm closing the other end or" the cylindric body and forming an amplifying chamber. said enlargement being apertured and said cylindric body being apert-ured around the amplifying, chamber.

2 A sound box comprising :1 cylindric boc y, en apertured wullclosing one end of said body and formed with a peripheral enlargement, a diaphragm, a supplemental diaphragm closing the other end oithe-cylindric body and forming an amplifying chamber having escape openings in the Well thereof.

In testimony whereof I affix my signature.

CHARLES J. DELMARMOL. 

